Calling line and party identification in automatic telephony



A. E. JOEL, JR CALLING LINE AND PARTY IDENTIFICATION.

Dec.I 6, 1949 IN AUTOMATIC TELEPHONY f 17 Sheets-Sheet 1 Filed May 22, 1947 /NI/ENTOR A EJOELj JR. By

A fr0/mfr Dec. 6, 1949 A. E. JOEL, JR

CALLING LINE AND PARTY IDENTIFICATION IN AUTOMATIC TELEPHONY Filed May 22, 1947 17 Sheets-Sheet 2 QON N .um

Dec. 6, 1949 A. E. JOEL, JR CALLING LINE AND PARTY IDENTIFICA 2,490,441 TIoN IN AUTOMATIC TELEPHONY 17 Sheets-Sheet 5 Filed May 22, 1947 l. .R .EN .www M .Gg M M h U M nNK ma, EJ. ww. O VE T .WA c m \|\V l Vl B v V h QQ b .um .W W W 1 A Q A T 1 EH Sv am T T j; n a, QN ww NS., mw Sm Al auf P Lw w u l x00 0U AA h n Dec. 6, 1949 A. E. JOEL., JR 2,490,441

CALLING LINE AND PARTY IDENTIFICATION IN AUTOMATIC TELEPHONY Filed May 22, 1947 17 Sheets-Sheet 4 t /NVENTOR Q A.E.JOEL JR. lg By C. /I/ML A T TORNE y Dec. 6, 1949 A. E. JOEL, JR

CALLING LINE AND PARTY IDENTIFICATION IN AUTOMATIC TELEPHONY 17 Sheets-Sheet 5 Filed May 22, 1947 www @NN gb M, ,M NJ W5 n WA. C DVD @GQ ATTORNEY Dec. 6, 1949 A, E, JOEL, JR 2,490,441

CALLING LINE AND PARTY IDENTIFICATION IN AUTOMATIC TELEPHONY Filed May 22, 1947 L 17 Sheets-Sheet 6 /NVENTOR ALJOEL, JR.

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ATTORNEY A. E. JOEL, JR CALLING LINE AND PARTY IDENTIFI Dec. 6, 1949 CATION IN AUTOMATIC TELEPHONY 17 Sheets-Sheet '7 Filed May 22, 1947 A.E.JOEL,JR. By (I.

ATTO/@N57 A. E. Jol-:1., JR 2,490,441

17 sheets-sheet s Q H Q U I@ CALLING LINE AND PARTY IDENTIFICATION IN AUTOMATIC TELEPHONY Dec. 6, 1949 Filed May 22, 1947 LLL rrr llll www H i L l wlllL M, f y L R MJ m VE .T WA. C A W JN ,mw wm Ill Dec. 6, .1949 A. E. JOEL, JR

CALLING LINE AND PARTY IDENTIFICATION IN AUTOMATIC TELEPHONY 1'7 Sheets-Sheet 9 Filed May 22, 1947 M) WU M wm ACN Dec. 6, 1949 A. E. JOEL, JR 2,490,441

CALLING LINE AND PARTY IDENTIFICATION IN AUTOMATIC TELEPHONY Filed May 22, 1947 17 sheets-sheet 1o ATTORNEY' Dec. 6, 1949 A, E, JOEL, 1R y 2,490,441

CALLING LINE AND PARTY IDENTIFICATION IN AUTOMATIC TELEPHONY Filed May 22, 1947 17 Sheets-Sheet 11 FIRST 'LINE /DENT/F/ER ATTO/PNEV 17 'Sheets-Sheet 12 A. E. JOEL, JR

1N AUTOMATIC TELEPHONY GNP CALLING LINE AND PARTY IDENTIFICATION Dec. 6, 1949 Filed May 22, 1947 /NVENTOR A EJOEL Je. BV

ATTORNEY Dec. 6, 1949 A, E;- JOEL, JR 2,490,441

CALLING LINE AND PARTY IDENTIFICATION IN AUTOMATIC TELEPHONY Filed May 22, 1947 nL7 Sheets-Sheet 15 /NVENTOA AE. JOEL JR. 5y

1 Dec. 6, 1949` A, E, JOEL, JR 2,490,441

CALLING LINE AND PARTY IDENTIFICATION IN AUTOMATIC TELEPHONY Filed May 22, 1947 17 Sheets-Sheet 14 /N l/E/v TOR A EJOEL ,JAR

ATTORNEY Dec. 6, 1949 A. E. JOEL, JR

CALLING LINE AND PARTY IDENTIFICATION 17 Sheets-Sheet 15 /NVENTOP A.'.J0EL,JR. By C. MAW@ A 7`TORNEV A. E. JOEL, JR

CALLING LINE AND PARTY IDENTIFICATION Dec. 6, 1949 IN AUTOMATIC TELEPHONY v 17 Sheets-Sheet 16 Filed May 22, 1947 NNE /NI/ENTOR ATTORNEY A. E. JOEL, JR 2,490,441

17 Sheets-Sheet 17 vg n@ Dec. 6, 1949 CALLING LINE AND PARTY IDENTIFICATION IN AUTOMATIC TELEPHONY Filed May 22, 1947 WE/v70@ A. E. JOEL,JR. By

C. )mma ATTORNEY Patented Dec. 6, 1949 CALLING LINE AND PARTY IDENTIFICATION IN AUTOMATIC TELEPHONY Amos E. Joel, Jr., New York, N. Y., assignor to Bell Telephone Laboratories, Incorporated, New York, N. Y., a corporation of New York Application May 22, 1947, Serial No. 749,827

` 14 Claims. 1 This invention relates to telephone systems and more particularly to a system in which it is desirable to register in equipment common to a plurality of subscribers lines the identity of any one oi the lines which may have originated a call.

In systems for this purpose, which have been proposed heretofore, it has been necessary to provide individual networks and special means f for obtaining access to these networks for identiiication. Such a' system is disclosed and claimed in the application of J. W. Gooderham, Serial No. 448,782, filed June 27, 1942.

In the crossbar system means exists for obtaining access to the sleeve of each line, when that line is called, to determine the busy or idle condition of that line. Such means is disclosed and claimed'in VUnited States Patent 2,201,573, granted to W. W. Carpenter et al., May 21, 1940.

In accordance with the present invention the same means is employed for connecting With the sleeve conductor of a line when that line is calling or when it is called.

In addition, groups of tone transmitting networks are provided common to the lines with means for connecting the sleeve conductors of lines to the networks during the different stages of identifying the calling line.

As set forth in the above-identilied Carpenter et al. patent, in the crossbar system there is a set of terminals for each line and a set of terminals for each line designation which terminals are cross-connected to transmit to a control circuit known as a terminating marker, the location, class, and busy oridle `condition of a called line, the last information being obtained from the sleeve conductor of the line. In order to permetering conductor of a calling line for determining, and obtaining access to, the frame to which the sleeve conductor is cross-connected and employing the sleeve conductor for identifying the line on the frame.

These and other features of the invention will 55 be more apparent from a consideration of the following description read in connection with the drawing in which:

Figs. 1 and 8 show three subscribers lines, together with the switches and district junctors over which outgoing calls are extended;

Fig. 2 shows in schematic form an outgoing trunk and an associated outgoing sender;

Figs. 3 to '7 and 13 to 17 show one of a plurality of identifiers;

Fig. 3 showing the sender-identifier connector;

Fig. 4 showing the frame group progress relays;

Fig. 5 showing the frame group identification control circuit;

Fig. showing the hundred block and twenty block identication control circuit;

Fig. 7 showing the units identification control circuit;

Fig. 13 showing the twenty block press circuit;

Fig. 14 showing the hundred block register relays;

Fig. 15 showing the detector input connector relays;

Fig. 16 showing the detectors and output relays;

Fig. 17 showing the detector output connector relays;

Figs. 9 and 12 show the number group frame;

Fig. 9 showing the cross-connecting racks, and

Fig. 12 showing the hundred block and twenty block relays;

Fig. 10 shows the marker number group multicontact connector relays;

Fig. 11 shows the identifier number group multicontact connector relays; and

Fig. 18 shows the manner in which the other iigures are to be arranged.

The control circuits of the identifier have been patterned after the control circuits of the aboveidentified Gooderham application and reference is made to that application for circuit details which have been omitted to simplify the present disclosure.

Briefly, when a calling line initiates a toll call,

the line is extended to a trunk outgoing to the toll oiiice and an outgoing sender is attached to the trunk to control the apparatus at the distant office and to transmit thereto the number of the called line. This sender also includes a calling line register and a recorder or ticketer which records the details of the call for charging purposes. When the sender has received the called number, it associates itself with an idle identifier which applies an identification tone to the sleeve conductor of the trunk whence it is returned 3 through the established connection to the sleeve conductor of the calling line and through a condenser at the district junctor to the metering conductor associated with the calling line. The metering conductors of all lines associated with one number group frame are connected through the individual message register or through a special network in multiple to a tone coil individual to the frame, The identifier is provided with a plurality of detectors which it connects with the frame tone coils by groups -until the applied tone is detected, whereupon the identifier connects with the corresponding number group frame. The identifier now operates all'eight of the hunclred block relays on the selected frame and op'- erates the first twenty block relay over the contact of each hundred block relay. Each twenty block relay connects the sleeve conductors of twenty lines to the identifier where they are con-- nected to networks which are in turn connected Yin multiple to a set of tonei coils, one for each ten lines, thereby testing: one hundred and sixty lines at a time. These tone coils are connected `with the'de'tectors which detect the tone applied to the'sleeve of the calling line if it is included in the group being tested; If not, a set of twenty block Aprogress:relays operates to release the first twenty block` relays and operate the second twenty. block relay overeach hundred block relay. When the tone is detected, one of the hundred 'blockrelays-"is-lreld 'operated in the number group frame to :supply Vthe thousands and hunidred's digits 'of-@the calling line number, and a twenty block progress relay and an even or odd tens Vrelay are 'held'. operated to supply the tens digit and to connect thetenfsleeve leads to` a set vof ten networks which arein turn connected to the detectors to identify the individual line -and 'operate :a units register relay which supplies the units digit. Whenthe units register relay has been operated the line number is transmitted :to the calling line .register in thexsender where it is transferred to the recorder along with the Yvotherrinformation necessary for 'nlling thecall.

Party line-Ring party When the subscriber Aat substation wishes te makea toll call, he removes his receiver from the s-witchhoek, thereby .initiating a series of operations resulting in the connection of his line with an idle district junctor such as junctor |01 'over primary line 4switch |03 and secondary line switch |04 and with an idle originating sender |123 overasender'link |22. He then dials the number of the ,-wanted-linevwhich is registered in the originating sender |23. The Sender |23 connects with an idle originating marker |25 through'the marker` connector |24 and transmits ,the designationof the `wanted office to the marker which functionsto lconnect the district junctor |01 through a set offswitches represented by switches ||4 and ||5 toat'runk outgoing to the toll oice. AWhen this connection has been established, va-gcircuit is closed from battery through the left ywindingrof-.the trunkline relay 20|, right l contact =of relay 200, conductor H1, through the l bridge established inI the rsender |231 and baci:

to conductor |f|'6left contactrof relay 200, right winding'of're'lay 20| to ground. Relay 20| oper- 4 of the call to the called line, a party identication circuit 201 for indicating when the tip party of a two party line is calling, a calling line number register 208, operated by the line identifier and a recorder or ticketer 209 for recording the details of the call for charging purposes.

When the sender has been attached to the trunk, relay 200 is operated to transfer the tip and ring conductors from relay to the sender f 205, after which the originating sender |23 transmits the called line designation to the called line number register 206. When the designation has been received, relay 2|0 operates to start the operation of the line identifier. The sender proceeds to control the completion of the connection in the appropriate manner.

:iti

When the control equipment at the originating oice has completed its functions relays |08 and |09 are operated in the district junctor |01 and the calling line is connected through to the sender 2051, where the party identication circuit functions -totest whether or Anot the calling substation is a tip party on Aa party line. Assuming that substation |00 is the ring party, the line will be ungrounded and relay 2|| remains unoperated. The above-identified Gooderham application discloses in-detail a typical operating circuit for such asrelay 2l-I, 4as well as typical circuits for such as relays 2 |0 and 2K1` to bereferred to hereinafter and for such as relayA 200 previously mentioned. Patent 2,235,803 to W. W. Carpenter of March 18, 1941 discloses indetail typical operating circuits for certain relays of district junctor |01, such as relays |08, |09, ||f| and |2.

Several identifiers are provided for use by a number of groups of trunks `and a connecting ar rangement similar to the standard marker connector is used 'to connect a trunk with an idle identier. When relay 2 |0 operates, it connects batn tery over the back contact of relay 2| 6 to conductor 21|2 operating relay 300 if'no other trunk of the group is using 'the connector at the time. Relay 300, in turn operates relay30 I, which extends bat- -tery'fon :conductor 2| 2 t'o the 'identier preference 'relays $10, v3`| |,.etc. VIf vthe preferred identifier `is idle,- `relayy320 is Aunoperat'ed and battery is extended over vthebaokcontact of relay 320 to the winding of relay 3|0 and ground. Relay 3|0 operates in turni operating relay 3'30. With relays 30| andV 330 operated, ia'plurality of circuits are completed 'between the trunk and the identier. vOne circuit'extends from ground over rthe con- A ita'cts o'f relaysl330 and 30 ,conductor 34| through the trunkc'onnector 'i204 to the winding of relay 2Y|4 'and battery.v Relay 2|'4 extends the sleeve conductor H8" of 'ithe 'trunk over its contact, through-connector '204, conductor `2 5, contacts of relays "30| yand '330 to i conductor 342.

`Since rela-y 2|| is normal, to Aindicate that a ring partyvis calling,V a circuit is closed from ground over the'ba'ckvcontactof relay 2| conduce `tor' 2|3, contacts of'relays 30| and 330, conductor 340winding offrelay '4|3'and battery. With relays1330 and 4|3^operated ,a circuit is closed from "battery 'through the winding of relay 408, right back contact of relay "409;1 front contact of relay 4|3, conductor 4|4 to ground at a contact of relayf330. -Relay A'4!l8"operates in this circuit, connecting a sourceof 270 cycle identification tone, "throughresistance*4"|5` to conductor 342 and as l above traced to'sleeve conductor |8, through the switches-1|5and"||4, and thence over two paths to 'the' number ygroup frame. One path extends over the inner lower contact of relay |09, back L' contact of relay |125 vlower 4contact of relay |08,

5 resistance. I .I I)r throu'gnlineswitches I 04 Aand |Il3 conductor I I9, to the Vindividual sleeve .cross-.cone nesting. .terminal Il. ,on .the number .groupframe rack. 900. The other pathf extends through condenser. .l I 3,- outer. .lower front .contact of .relay I 9% back contact...offrelay3.I I2, back contact of relay I I I, which is notoperatedsince thecalling line is a ring.. party.through they linel switches IEM and I 03 ..to QrneteringV .conductor ,I 23;. `through ,message register' 835 to conductor 850`and thence .to ground throughthe. primarywinding of .tone coilf 9.I L!

' All ofthe message ratesubscriberslines .which appear onlthis .number groupjrame halve their message registers connectedwith ground through the winding offtone .coil .QIIJ Whether .partyline ordndiizidual line. and thereis a simila'rtone-v coil SI L etc. for.. each of theotherv number group frames; .Since the message registers of an ofc are'.arranged on special .racks in groups cor responding. to blocks of one hundred consecutive directorynumbers,..the*connection of the message. registers .to theT proper number group frame coil .is easily accomplished..- Individuallines havingl nonlessage registers have .their metering conductors connecteddirectly to-the. primary windingofv the corresponding number group tone coil.

' For' .two.party.at rate lines, a second or tip setof coils is provided .for the tip party and the singlemetering .conductor inthe line switches is connected in lmultiple througha pair of resistance and .condensernetworks .tolthe ring coil of the number groupin .whicliithe ring .party number appears andtotheiti'p' coil .of theY number group in which thetip 'party number appears.

As has been indicated. in the drawing, the numbers assigned to thetwoparties on a line may appear -onthe-samenumber. group frame as `in the case of. substations...l0ll-and II or may appear. ondiierent number group frames as indicated for substations 815B. and SE I.

The.identiiienrstdooks.-or the number group frame. to whichlthe'callingline is assigned. For the purpose, oirecognizing. the identication tone, a set of sixteen .detectorsl to IIiI-are provided, Whichare .substantiallythe same as those employed in the aboveV-identied Gooderham `application. Since there .aramore .number group frame tone. coiisthamthe.numberof detectors, which is made vsuiiiciern; for subsequent steps of the. identication, the; number.- group. framesare tested in groups....\and,.a set .of progress relays 4B!) to 455. is provided ,for controllingthe progressive tests of thelgroups.

When the identiiierisready to vfunction, the

timer l3'fcauses,.ground to be connectedA to a number. oi olnormal conductors .including con-v ductorl.v "Ground `on conductor Sie completes a circuit overtheleftback .contactof relay 5l2v, conductor IIIi, .left back. contact .of relay 499, conductor .lillicontact 4. of relay 'Ii I, conductor '124.to the windingof relay.V |592 and battery, to extend the. input circuits-.fof the detectors I 696 to I5 I 5y toward therame ,tone coils. v

Ground onlconducto'r- 5I6 also. completes a circuit over the back-.contactsof relays5l3, 5I0 and of the frame .register relays 562, 5M, 53d; etc. to battery through `the winding of number4 group test startrelay 5I land battery. Relay'II operates, locking to ground over the back contact of relay 5I3 independent of the frame register relays. Withrelay 5II operated, a circuit is closed from ground on conductor l, overthe back contact of relay5I2, contact. 3 of relay 5I I, conf ductor 5I'I`, contact I of relay 465, conductorfll, -contact of relay 33e through. the .windingsof 6. frame .group relays,.302 ,andi393 to .battery Refiv lays 302Wand 303`bperate tojconnectthe sec ondary windings of the tone coils. on the rst group of `number grOupirames vto the. contacts of relay i502 and thence tothe input circuits of the detectors` Ground extended toconduc'tor 5II.as..above tracedalsocompletes -a circuit over contactof relay 405 to the. winding. .of relayy I El and battery. Relay. lill] .operates and yatlits lower contact-con;` nects ground to'conductor '429,' completinga circuitfor relay I'IllZwhich connects their-amaregister relays 5M, etc..l to the output relays of .the

detector. Y Y

Since the calling substation Iin has been shownas .connected to the first number group frame in the rst .group of frames the tone connectedl to .the prmaryewinding of .coil 9 I llfwill :be transmitted fromthelsecondary winding .of coil S I lfthrough cabled leads QSII and `532 fover normal-contacts oikrelay .336, contacts 'of relay 302; cabled .leads 363, contacts oi .relay H592 to the. inputoi detector ,Iiiwff Thev .detector lliilra spends .to the .identification tone, operating., p0.- lariae'd relay .i S20, inf itS output` circuit. i

Whenrelay 1502 operatedfit connected ground tol .the armatures ofiall of .thepolar'ized relays. At` the. sainel time. thatitimer. H93 causedrelay I 592 'to be operated. it. Aconnected ybattery to con. ductord; preparingrelays.- IGfto Mv for operation.

Therefore, when'det'ector relay AI62e`operates to indicate .that theuidntiiicationtone has been detected by detector .I fa circuit is closed from groundat the frontjcontactlof relay I52,"con' tact of relay l-Zllfwind'ing andnormalcontact of output relay 154 Q to ,battery Qnconductor I 'M62 Relay ,llliiloperatea lockingtofbattery. over its alternate contact andcloses a circuit for relay 58e .in the frame register... Thisfcirc'uit. may be tracedfrom battery over thiupper front contact of relay I64S,"conductorr Ilifjfro'nt contact of relay I'I02,""conductorx IIll'l` through. cable H08; left windingk .of relay 80," conductor 5 l E `through cable I'I8,"front contact Vof relay I'Iijconductor I'llf lower, frontcontact of relaylILba'ck contacts of, the remaining `outpiulrelays liiil; I, w49, IGM,y I655, etc. to ground.

Relay` 505] operates inthe above traced circuit andlocks in .a circuit from lground through its rightwinding and contact. 4, 'Contact I of relay SII to battery through the winding o relay li. Relay 5I() 'operatesin this" locking circuit for relay 5IN).v Atits contact. 3,"relay 50,0 also closes a circuit. from o1T.-riormal ground to .conductor 5,23 and thence overzaljcontact of. relay MB, and conductor 625 to fthe winding .of relay 3% and battery. Relay.Slperates disconnecting the secondary .winding ofthe'tone coils on this number group frame from thete'st vdetector Hill!) `to prevent any other `identierl from attempting to connectwiththis number group frame.

With relays ,fllland 5l!! operateda circuit isclosed from I,battery through .the winding of slow to operatarelay, SIL-front contact of relay 5MB, contact S. ofrelay.. 508,-conductor. 5I9, front contact of relay Mil, conductor. 132B, to groundv at .the right contactofrelay Sj Relays 5i@ and Sdopen the operatingcircuit of relay 5I I, but that relayremainsoperated under the controi of relay 5I3 to oit-normalgnnmd.v When relay 5I2 operates after-an interval,determined by its slow to .operate character., :it disconnects `ground from conductor. 5 Il.,v releasingrelays` 3621,.. 333,.-51 0 Aand from conductor .'I.I 6,releasingrelay |502, the rer 

